Final answer:
The movement performed when raising the scapulas is called shrugging. It involves the elevation of the scapulae. The masseter muscle is responsible for chewing, which is distinct from shoulder movements.
Step-by-step explanation:
When you raise your scapulas, the movement performed is known as shrugging. The action of shrugging specifically involves the elevation of the scapulae, which is an upward movement of the shoulder blades. This action is distinct from other movements such as blinking, yawning, or flexing the various muscles in the body.
The masseter muscle is involved in the process of chewing (b. chewing) as it elevates the mandible to close the mouth and aids in mastication. As for the movement at the scapulae during a shoulder shrug, both elevation and a slight upward rotation occur.
In the context of taking a step forward, the joints and motions involved include the hip joint performing flexion to move the leg forward, the knee extending to straighten the leg, and the ankle joint plantarflexing to push off the ground. Throughout this motion, the foot typically maintains a constant angle relative to the leg.